feat(ui): full‑width ShadTable across app; fix rent dialog width; correct equipment pagination

- ShadTable: ensure full-width via LayoutBuilder+ConstrainedBox minWidth
- BaseListScreen: default data area padding = 0 for table edge-to-edge
- Vendor/Model/User/Company/Inventory/Zipcode: set columnSpanExtent per column
  and add final filler column to absorb remaining width; pin date/status/actions
  widths; ensure date text is single-line
- Equipment: unify card/border style; define fixed column widths + filler;
  increase checkbox column to 56px to avoid overflow
- Rent list: migrate to ShadTable.list with fixed widths + filler column
- Rent form dialog: prevent infinite width by bounding ShadProgress with
  SizedBox and remove Expanded from option rows; add safe selectedOptionBuilder
- Admin list: fix const with non-const argument in table column extents
- Services/Controller: remove hardcoded perPage=10; use BaseListController
  perPage; trust server meta (total/totalPages) in equipment pagination
- widgets/shad_table: ConstrainedBox(minWidth=viewport) so table stretches

Run: flutter analyze → 0 errors (warnings remain).

lib/screens/common/widgets/standard_states.dart

@@ -76,13 +76,13 @@ class StandardErrorState extends StatelessWidget {
             ],
             if (onRetry != null) ...[
               const SizedBox(height: ShadcnTheme.spacing6),
-              ShadcnButton(
-                text: '다시 시도',
-                onPressed: onRetry,
-                variant: ShadcnButtonVariant.primary,
-                textColor: Colors.white,
-                icon: const Icon(Icons.refresh, size: 16),
-              ),
+      ShadcnButton(
+        text: '다시 시도',
+        onPressed: onRetry,
+        variant: ShadcnButtonVariant.primary,
+        textColor: ShadcnTheme.primaryForeground,
+        icon: const Icon(Icons.refresh, size: 16),
+      ),
             ],
           ],
         ),
@@ -185,10 +185,7 @@ class StandardInfoMessage extends StatelessWidget {
           Expanded(
             child: Text(
               message,
-              style: TextStyle(
-                color: displayColor,
-                fontSize: 14,
-              ),
+              style: ShadcnTheme.bodySmall.copyWith(color: displayColor),
             ),
           ),
           if (onClose != null)
@@ -235,14 +232,8 @@ class StandardStatCard extends StatelessWidget {
       decoration: BoxDecoration(
         color: ShadcnTheme.card,
         borderRadius: BorderRadius.circular(ShadcnTheme.radiusMd),
-        border: Border.all(color: Colors.black),
-        boxShadow: [
-          BoxShadow(
-            color: Colors.black.withValues(alpha: 0.05),
-            blurRadius: 10,
-            offset: const Offset(0, 4),
-          ),
-        ],
+        border: Border.all(color: ShadcnTheme.border),
+        boxShadow: ShadcnTheme.shadowSm,
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -294,4 +285,4 @@ class StandardStatCard extends StatelessWidget {
       ),
     );
   }
-}
+}